libc-tsd.h

/* libc-internal interface for thread-specific data. Stub or TLS version. Copyright (C) 1998,2001,02 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */#ifndef _GENERIC_BITS_LIBC_TSD_H#define _GENERIC_BITS_LIBC_TSD_H 1/* This file defines the following macros for accessing a small fixed set of thread-specific `void *' data used only internally by libc. __libc_tsd_define(CLASS, KEY) -- Define or declare a `void *' datum for KEY. CLASS can be `static' for keys used in only one source file, empty for global definitions, or `extern' for global declarations. __libc_tsd_address(KEY) -- Return the `void **' pointing to the current thread's datum for KEY. __libc_tsd_get(KEY) -- Return the `void *' datum for KEY. __libc_tsd_set(KEY, VALUE) -- Set the datum for KEY to VALUE. The set of available KEY's will usually be provided as an enum, and contains (at least): _LIBC_TSD_KEY_MALLOC _LIBC_TSD_KEY_DL_ERROR _LIBC_TSD_KEY_RPC_VARS All uses must be the literal _LIBC_TSD_* name in the __libc_tsd_* macros. Some implementations may not provide any enum at all and instead using string pasting in the macros. */#include <tls.h>/* When full support for __thread variables is available, this interface is just a trivial wrapper for it. Without TLS, this is the generic/stub implementation for wholly single-threaded systems. We don't define an enum for the possible key values, because the KEYs translate directly into variables by macro magic. */#if USE___THREAD# define __libc_tsd_define(CLASS, KEY) \ CLASS __thread void *__libc_tsd_##KEY attribute_tls_model_ie;# define __libc_tsd_address(KEY) (&__libc_tsd_##KEY)# define __libc_tsd_get(KEY) (__libc_tsd_##KEY)# define __libc_tsd_set(KEY, VALUE) (__libc_tsd_##KEY = (VALUE))#else# define __libc_tsd_define(CLASS, KEY) CLASS void *__libc_tsd_##KEY##_data;# define __libc_tsd_address(KEY) (&__libc_tsd_##KEY##_data)# define __libc_tsd_get(KEY) (__libc_tsd_##KEY##_data)# define __libc_tsd_set(KEY, VALUE) (__libc_tsd_##KEY##_data = (VALUE))#endif#endif /* bits/libc-tsd.h */